Notes posted by etoastw

The created_at/created_on thing clearly relates to the columns that have been
defined in your model – it’s got nothing to do with Rails 2.1 (although the Rails 2 “timestamp” method adds the created_at
column).

And find(:first), find(:last) return model objects,
rather than arrays/result sets, which is why you can’t do a map on them
– you can’t do anything that you would do on an Enumerable, unless the model object itself is
Enumerable.